Adhesion to IB3-1 cell monolayer by S. maltophilia OBGTC9 and OBGTC10 wild type strains, and relative fliI- mutants. A. The adhesiveness of OBGTC9 and OBGTC10 flagellar mutants fliI- was significantly lower than that of wild type strains (** P < 0.001 vs OBGTC9 fliI-; °° P < 0.001 vs OBGTC10 fliI-; ANOVA-test followed by Newman-Keuls multiple comparison post-test). Results are expressed as means + SDs. B. The inactivation of the fliI gene was confirmed by swimming motility assay: OBGTC9 wild type (left), and relative fliI- mutant (right).